JPH1139053A - Small-sized electronic appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent robbery of a small-sized electronic appliance even when it is left on a desk or the like and to efficiently prevent leakage of information. SOLUTION: A portable computer 10 is equipped with a main body side infrared ray function part 28 and, when it cannot receive the infrared ray from an infrared ray function part 33 outside the main body, rock machineries 24 and 25 are operated on an assumption that the computer itself is taken away, a cover part 13 keeps this state under a condition in which it is closed to cover a computer body 1, protects a circuit device inside and also suppresses an act of robbery by emitting an alarm. To release the condition in which the portable computer 10 is rocked, a predetermined password needs to be inputted from an infrared ray communication remote controller 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable small electronic device such as a portable computer or a small information terminal, and more particularly, to a small electronic device having an infrared device for communication.

[0002]

2. Description of the Related Art While computer performance has improved,
Many small electronic devices, such as portable computers and electronic organizers, using liquid crystal displays have appeared. In particular, a portable computer is not only convenient to carry, but also has a more efficient desk area than a large CRT display with a large depth or a case for a large desktop computer. Can be used. For this reason, in recent years, there have been many cases where the computer is used as a substitute for a stationary computer in an office or at home.

[0003] By the way, such a portable small electronic device is originally weighed and sized to be portable regardless of whether the owner intends to keep it on a desk or not. I have. Therefore, for example, when the user leaves home on an office desk and goes home, there is a possibility that a situation may occur in which a third party takes this without permission. Conventionally, in order to prevent such a situation represented by theft and to prevent theft of information stored in small electronic devices, these small electronic devices are conventionally tied to a pillar or desk with a chain when returning home. And locking them in a desk. However, such conventional measures are inconvenient in that attachment and detachment of the chain are troublesome, and cannot be carried out when there is not enough space for a small electronic device in the drawer of the desk. was there. Also, as seen in theft of bicycles, if you do not attach a fairly sturdy chain, the chain will be easily cut, and if you try to attach a sturdy chain, the space and strength for mounting on the portable computer side will be increased. There was no problem.

Japanese Patent Application Laid-Open No. 5-35355 discloses a technique in which two types of sensors, a P sensor for detecting the installation pressure of a portable computer and a C sensor for detecting an inclination, are attached to the portable computer. ing. In this technology, the installation status of the computer body is monitored using the detection outputs of these two sensors,
When a change is detected, the power is turned off. In this case, a key lock is performed by hardware, so that the main body cannot be used thereafter to protect the internal information.

FIG. 11 shows a control flow for protecting a portable computer according to Japanese Patent Application Laid-Open No. 5-35355. When the removal of the portable computer by an unauthorized person is detected after the portable computer monitoring system is connected (step S101) (step S102), the monitoring system is shut off (step S103) and the buzzer sounds (step S104). ). Then, the system of the portable computer is shut off (step S105), and the use of the computer becomes impossible, thereby protecting the internal information (step S106).

In Japanese Patent Application Laid-Open No. 62-290997, for example, a signal carried by a device carried by a human body continuously emits signal waves such as radio waves, infrared rays, lasers, and ultrasonic waves, and is arranged in a range where the signal waves can be received. The receiving unit and the sound generation circuit are arranged in a possession such as a handbag. Thus, if these belongings are misplaced or stolen, the sounding circuit emits a sound to warn the user.

Further, in Japanese Patent Application Laid-Open No. Hei 5-176374, the personal computer monitoring device can communicate with each of the subordinate personal computers by radio waves, and when each personal computer is started, the user ID, the password, the location of the personal computer, etc. Is to be sent. The personal computer monitoring device checks the received signal and transmits a use permission signal to the personal computer in a state where use is permitted. Further, in the case of a personal computer that has been illegally obtained from another location, its use is not permitted and the power of the personal computer is kept off, so that the contents of the file can be protected.

[0008]

SUMMARY OF THE INVENTION Among them, Japanese Patent Laid-Open No.
According to the technology disclosed in Japanese Patent No. 35355, even when the buzzer sounds, there is no person around as in the case where all the office members return home, If it is put in such a container, it can be easily carried, which is insufficient in terms of security. Further, even if the portable computer is forcibly made inoperable by turning off the power, it can be easily disassembled after the theft. Therefore, once a storage medium such as a hard disk is removed from the main body, important data stored in the storage medium can be read out, and security cannot be completely secured. In addition, many of these parts can be shared by computers, so expensive parts may be used or sold to others.

Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 62-290997, the owner himself or herself goes far away from the property such as a portable computer due to returning home, so it is necessary to cancel the alarm at this time. . That is,
This proposal only applies to what the owner carries together, so it cannot be applied to what is left in the office. Of course, if you leave your personal equipment close to your portable computer or other property, you will be able to monitor the removal of only your property, but if you remove them together, an alarm will be generated. Nor.

Further, according to the technique disclosed in Japanese Patent Application Laid-Open No. 5-176374, if a stolen item is brought into an office or the like where a personal computer monitoring device is used and used, the use of the personal computer is surely prohibited or stolen. It can be determined that the product is a product. However, in such a case, it is a completely rare case and does not cause any problem in using the personal computer at home or elsewhere. Also, since no measures have been taken to prevent theft itself, it is completely free to take away the personal computer itself.

Therefore, an object of the present invention is to prevent a small electronic device from being stolen even if the small electronic device is left on a desk or the like.
An object of the present invention is to provide a small electronic device capable of effectively preventing information leakage.

[0012]

According to the first aspect of the present invention, (a) infrared receiving means for receiving infrared rays transmitted from a predetermined transmitting source, and (b) the infrared receiving means is provided with the predetermined transmitting means. A locking means for holding a lid portion, which is openably and closably disposed on a main body portion containing the circuit device, when the infrared ray transmitted from the source is no longer received, and (c) input from outside. When the password matches a preset value, the small electronic device is provided with a lock release means for releasing the lock of the lock means and opening and closing the lid.

That is, in the first aspect of the present invention, when the infrared receiving means stops receiving the infrared rays transmitted from the predetermined transmitting source, the infrared receiving means is disposed to be freely openable and closable on the main body housing the circuit device. The lid is kept closed, so that the lid cannot be opened unless the lock is released using a password, making it impossible for a third party to disassemble the small electronic device.

According to the second aspect of the present invention, (a) infrared receiving means for receiving infrared rays transmitted from a predetermined transmitting source, and (b) an anti-theft mode for setting the device to an anti-theft mode for preventing theft. Setting means; and (c) housing the circuit device when the infrared receiving means stops receiving infrared rays transmitted from the predetermined transmission source in a state where the anti-theft mode setting means sets the anti-theft mode. (D) when the password input from the outside matches a preset value, the locking means is unlocked to lock the lid part which is openably and closably disposed on the main body part. And a lock release means for opening and closing the portion.

In other words, the invention according to claim 2 accommodates the circuit device when the infrared receiving means stops receiving infrared rays transmitted from a predetermined transmission source with the small electronic device set to the anti-theft mode. The lid part that can be freely opened and closed on the main body part is kept closed, so that the lid part can not be opened unless this lock is released using a password, and a small electronic device by a third party Makes disassembly impossible. As described above, the function for preventing the theft of a small electronic device can be turned on / off depending on whether or not the anti-theft mode is set.

According to a third aspect of the present invention, in the first or second aspect of the invention, a password input from the outside is input from a portable remote controller by infrared rays. If you have a portable remote controller in this way, you can take this small electronic device outside, and if you misplace it in a place where you are away from home, you can avoid the inconvenience of information theft. Can be avoided.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the main body portion housing the circuit device is formed of a metal case having an opening portion opened in only one direction, and The portion is characterized by comprising a display having a structure for opening and closing the opening. Thus, if the lid is locked and cannot be opened, the circuit device cannot be removed from the main body, so that leakage of information can be prevented.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows an outline of a circuit configuration of a portable computer as a small electronic device according to an embodiment of the present invention. This portable computer 10
Is a computer main body 11 and the computer main body 1
1 and a lid portion 13 which can be freely opened and closed by a hinge mechanism 12. A liquid crystal display (LCD) 14 is incorporated in the lid 13 on the side facing the computer main body 11.

In the computer main body 11, a DC (Digital-to-Digital) converter 21 for inputting a DC power supply and converting the DC power into a desired voltage is provided.
A power supply circuit 2 for supplying a DC voltage obtained from the converter 21 to each circuit inside the computer main body 11
2 and a battery 2 for supplying power from a built-in power supply
3, a pair of lock mechanisms 24 and 25 for locking the operation of the liquid crystal display 14 in a predetermined case, an LCD lock control circuit 27 for controlling the lock mechanisms 24 and 25, and the LCD lock control. It is connected to a circuit 27 and includes a main body side infrared function unit 28 for performing infrared communication. An AC (alternating current) adapter 31 for supplying DC power to the DD converter 21 is arranged outside the computer main body 11, and is connected to a commercial power supply 32. In addition, the portable computer 10 includes an infrared function unit 33 outside the main body as an attached device.
And an infrared communication remote controller (remote controller) 34, and the external infrared function unit 33 is connected to a commercial power supply 32 for power supply.

When the AC adapter 31 is not connected to the commercial power supply 32, the battery 23 supplies power to a memory described later in the portable computer 10 to maintain information,
In a state where 0 is set to the anti-theft mode, power is supplied to the main body side infrared function section 28 to realize a state where control for preventing theft is performed.
Further, when the power is turned off while the portable computer 10 is set to the anti-theft mode, the LCD lock control circuit 27 is operated, and the lid 13 is held in that state when the cover 13 is closed. .

FIG. 2 shows the appearance of the portable computer of this embodiment. First and second metal hooks 41 and 42 are attached to both upper corners of the lid portion 13 of the portable computer 10 in the drawing, and these hooks are hooked at corresponding locations on the computer main body 11. The first and second latch holes 43 and 44 are formed. The right side 4 of the computer main body 11
5 is provided with a lock lever 46 for unlocking the portable computer 10 and a fitting hole 53 for fitting the metal fitting 52 at the tip of the chain 51 into the portable computer 10. Further, on the front face 55 of the computer main body 11, an infrared transmission / reception window 56 of the main body side infrared function section 28 is arranged. Although not shown in this figure, a lock lever 46 is similarly arranged on the left side surface of the computer main body 11.

FIG. 3 shows a component arrangement of state data obtained by disassembling the portable computer. The portable computer 10 includes the hinge mechanism 12 described above.
Thereby, the lid portion 13 can be opened and closed with respect to the computer main body 11. The hinge mechanism 12 includes a pair of cylindrical fittings 12A arranged on the computer main body 11 side, and pins 12B provided on the lid portion 13 side and loosely fitted to these tubular fittings 12A. In order to prevent the hinge mechanism 12 itself from being broken when the lid portion 13 is closed, the assembled hinge mechanism 12 covers an opening on the front surface thereof with a protective lid 57.

The computer main body 11 is provided with a battery 23, a hard disk 62, and a main body side infrared function section 28 on the bottom inside a box-shaped case 61 made of a light metal such as titanium.
And a circuit component such as a memory element 63. A keyboard 64 is provided with a screw 6
5 is fixed to the case 61.
The side wall of the case 61 has a certain thickness, and the position immediately above the lock lever 46 is provided with a hook hole 4 for inserting and hooking the corresponding first or second hook 41, 42.
3, 44 are drilled.

The portable computer 10 of the present embodiment
Indicates that the lid portion 13 is set in the anti-theft mode.
Is closed, the lock lever 4 inserted in the locking hole 67 is closed.
6 has a structure in which it is hooked and locked by a hook which will be described later. Further, the case 61 is an integral type, and does not have a structure in which the bottom plate is attached with screws. Therefore, the portable computer 10 cannot be disassembled from the bottom side of the computer main body 11, and the screws 65 cannot be removed unless the lid 13 is opened in the locked state of the portable computer 10. That is, the keyboard 64 is removed and the hard disk 6 is removed.
It is impossible to take out internal components such as the second.

FIG. 4 shows a state in which the lid of the portable computer is closed. When the lid 13 is closed as described above, the lid 13 covers the front of the protective lid 57 on the computer main body 11 side. Therefore, when the portable computer 10 is locked in the anti-theft mode, the protective cover 57 cannot be removed to separate the computer main body 11 from the lid portion 13. The inside of the portable computer 10 is disassembled by a method of separating the two. You can't.

FIG. 5 shows a state in which the mechanism of the lock mechanism has been released, and FIG. 6 shows a state in which the lock mechanism has been operated to be in the locked state. Lock lever 46
The connecting bracket 72 protruding from the bottom surface toward the inside of the computer main body 11 has a longer length than the latching bracket 73 slidably disposed in the second latching hole 44 shown in FIG. 5 or FIG. The holes 75 are connected so as to be loosely fitted. Therefore, when the metal lock lever 46 moves in the direction of the arrow 71, the latch metal 73 is also integrally formed with the second latch hole 4.
4 move inside. FIGS. 5 and 6 show the right side surface 45 of the portable computer 10. On the left side, the first latch 43 (see FIG. 3) engages with the corresponding first hook 41, but since this relationship is exactly the same as that of the second hook 42, this description is omitted. I will omit it.

The upper part of the latch 73 constitutes a key 73A bent at a right angle so as to latch the second hook 42 partially embedded in the lid portion. Therefore, as shown in FIG. 5, the lock lever 46 is moved in the second hook hole 44 into the second hook 42 against the reaction of the spring (not shown).
When the second hook 42 is moved to the limit position in the direction away from the right side (rightward in the figure), the second hook 42 is inserted into the second hook hole 44, and the lid portion 13 is completely closed as shown in FIG. it can. In this state, if the operator releases his hand from the lock lever 46, the key 73A is released by the return force of the spring.
The tip of the second hook 42 fits into the recessed portion. As a result, the lid 13 of the portable computer 10 is locked.

However, when the portable computer 10 is not set to the anti-theft mode, the operator can freely move the lock lever 46 in the direction of the arrow 71. That is, the hook 73 of the second hook 42
Can be released at any time, and the lid portion 13 can be opened as shown in FIG. When entering the anti-theft mode, the lock lever 46 cannot move in the direction of the arrow 71 as will be described below.
It is necessary to meet two conditions.

An environment in which communication with the infrared function unit 33 outside the main unit shown in FIG. 1 is possible. That is, when the main body-side infrared function section 28 cannot communicate with the outside-body infrared function section 33 as in the case where the portable computer 10 of the present embodiment is removed from the desk, the locked state is released. It is not possible.

Inputting a preset password to the portable computer 10 from the infrared communication remote controller 34 shown in FIG. That is, even if the user tries to operate the lock lever 46 at the place where the portable computer 10 is installed, the locked state cannot be released unless a password is input from the infrared communication remote controller 34 and the passwords do not match.

The release of the lock state is controlled by the LCD lock control circuit 27 shown in FIG. And
In a state where the above condition is not satisfied and the release of the lock is not allowed, the pair of lock mechanisms 24 and 25 shown in FIG. There can be various such mechanisms.

For example, each of the lock mechanisms 24 and 25 has a solenoid, and moves a plunger (not shown) in accordance with turning on / off of a power supply. A hole for fitting the tip of the plunger is formed in the latch metal 73 shown in FIGS. 5 and 6, and the position where the tip of the plunger and the hole just face each other in the locked state shown in FIG. Is set to Therefore, if the tip portion of the plunger is fitted into this hole while the portable computer 10 is set in the anti-theft mode, the locking member 73 can be prevented from moving and the locked state can be continued.

FIG. 7 shows the main part of the circuit configuration of the portable computer of this embodiment. The portable computer 10 has a CP for performing various controls.
A U (central processing unit) 81 is provided. The CPU 81 is connected to each unit in the apparatus via a bus 82 such as a data bus. The ROM 63A is a read-only memory that stores components for controlling each unit of the portable computer 10. The RAM 63B is a working memory for temporarily storing various data, and is constituted by a random access memory. The keyboard unit 64 is connected to the bus 82 via an input circuit 83, and performs key input of various data. The hard disk 62 is connected to a bus 82 via a disk control circuit 85 such as a ska card, and stores data such as created documents and programs for various controls. The main body side infrared function section 28 and the lock mechanisms 24 and 25 are also connected to the bus 82.

FIG. 8 shows the control at the first power-on after purchasing the portable computer. Note that this control and other controls to be described later, which are related to the computer main body 11, are the same as those shown in FIG.
This is realized by executing a program stored in the M63A or the hard disk.

First, when the power of the portable computer 10 is first turned on (step S201: Y), FIG.
Is displayed on the liquid crystal display 14 (step S202). When the portable computer 10 is purchased, the locking mechanism, which will be described in detail later, has not been activated, so that the operator has to operate the lid 1.
3 can be opened to operate the keys. When the operator inputs the password (step S203: Y), the CPU 81 displays a setting request to set the anti-theft mode on or off on the liquid crystal display 14. If it is set to one of the operators (step S205:
Y) After that, the CPU 81 sets the portable computer 1
It waits for the point at which the power supply 0 is turned off by software (step S206). When the power is turned off (step S206: Y), the anti-theft mode stored in the nonvolatile memory area of the RAM 63B is turned on and off.
Read off information. As a result, when the anti-theft mode is set (step S207: Y), the lock mechanism is operated. That is, it is locked with the lid 13 closed. If the anti-theft mode is not set (step S207: N), the process is terminated without operating the lock mechanism (end).

FIG. 9 shows a flow of operations for temporarily releasing the lock in the anti-theft mode in which the lock mechanism is operating. As described above, when the lock mechanism is operating, the lid portion 13 remains closed. In order to cancel this state, it is necessary to transmit a password from the infrared communication remote controller 34 shown in FIG. When the password is sent, the main body side infrared function unit 28 receives this (step S301). CP
U81 compares the received password with a registered password stored in the nonvolatile memory area of the RAM 63B (step S302). If they match (step S303: Y), the lock mechanism is released assuming that the owner of the portable computer 10 has performed a release operation (step S304). On the other hand, if the transmitted password is incorrect (step S303: N), the lock mechanism is not released.

FIG. 10 shows a state of control when the portable computer is to be taken away.
As shown in FIG. 2, the portable computer 10 according to the present embodiment cannot be taken away from a desk or the like by fitting the metal fitting 52 at the tip of the chain 51 into the fitting hole 53 of the portable computer 10. . However, in the event that there is a person who intends to remove the portable computer 10 despite this, use of the portable computer 10 and disassembly of the computer main body 11 can be prevented.

That is, in the anti-theft mode, the CPU 81 monitors whether infrared rays including predetermined ID information are constantly transmitted to the main body side infrared function section 28 from the external infrared function section 33 shown in FIG. (Step S40
1). The reason why the identity information is checked for identity is that the person who took away the portable computer 10 receives infrared rays from the similar infrared function unit 33 outside the main body, so that the detection of the removal is not unavoidable. That's why. However, depending on a check system for preventing theft, even a person who simply checks whether or not infrared rays are received is sufficient.

If the infrared function is not received by the infrared function unit 28, or if the ID information is different even if received, the CPU 81 determines whether or not the portable computer 10 is powered off by software. A determination is made (step S402). When the power is off (Y), an alarm sound is generated by a buzzer (step S403), the lock mechanism is activated (step S404), and the lid 13 of the portable computer 10 is not opened. I have to.

If the power is not turned off (step S402: Y), a warning is displayed at this point instructing to return the portable computer 10 to its original location (step S405). The warning display may be performed by displaying words and pictures on the liquid crystal display 14, or may sound a buzzer or output a warning sound. If the original owner of the portable computer 10 moves the portable computer 10 to another place for some reason, the portable computer 10 is returned to its original position before the predetermined time t has elapsed (step S406: N). No display is made.

On the other hand, if the portable computer 10 is not returned to its original position after a predetermined time has elapsed, there is a possibility that the portable computer 10 is stolen. Then, time t
Then, it is checked whether the same ID information has been received at the point in time when elapses (step S407). If the same ID information is used (Y), it means that the portable computer 10 has been placed at a position where it should normally be placed. Therefore, in this case, since the theft has not occurred, the process is terminated without operating the lock mechanism (END).

On the other hand, if the infrared information is not detected when the time t has elapsed or the ID information is not the same even if the infrared light is detected (step S407: N), the power supply of the portable computer 10 is shut off by software. (Step S408). Then, the portable computer 10 is locked with the lid portion 13 closed (step S404) so that the computer main body 11 cannot be disassembled.

The portable computer 10 of this embodiment can set the anti-theft mode to be released on condition that the passwords match while the portable computer 10 is operating. Therefore, when bringing the portable computer 10 to a place where the user is going out, by canceling the anti-theft mode, the monitoring of taking out by infrared communication with the infrared function unit 33 outside the main body can be canceled.
When the portable computer 10 is carried as described above, the computer can be started even when the anti-theft mode is set by carrying the infrared communication remote controller 34.

When the portable computer 10 is carried as described above, the mode can be shifted to a mode in which the lock mechanism is activated when the power is turned off, instead of the control described with reference to FIG. . By setting such a special mode, if the portable computer 10 is misplaced, a third party cannot open the lid 13 and security can be ensured.

[0047]

As described above, according to the first aspect of the present invention, when the infrared receiving means stops receiving infrared rays transmitted from a predetermined transmission source, the infrared ray receiving means is mounted on the main body housing the circuit device. Since the lid, which is freely openable and closable, is kept closed, the anti-theft effect can be easily enhanced by using infrared communication means provided in many small electronic devices. In addition, since the lid cannot be opened unless the lock is released by using a password, it is possible to prevent a third party from accessing the small electronic device and taking parts out.

According to the second aspect of the present invention, since the on / off control of the anti-theft mode can be performed, the small electronic device can be used jointly in an environment where theft is unlikely to occur. There is an advantage that it is not necessary to take a special procedure when opening the lid of the electronic device, and the functions of the device can be used properly according to the environment.

Further, according to the third aspect of the present invention, if the user possesses a portable remote controller, the user can take the small electronic device outside, and if the user forgets to put the small electronic device away from home or the like. Also, it is possible to avoid inconveniences such as information being stolen.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a circuit configuration of a portable computer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a portable computer as a small electronic device according to an embodiment of the present invention in a state where a lid portion is opened.

FIG. 3 is a perspective view showing an arrangement of parts in a state where the portable computer of the embodiment is disassembled.

FIG. 4 is a perspective view showing a state in which a lid portion of the portable computer of the embodiment is closed.

FIG. 5 is a perspective view showing a state where a mechanism portion of a lock mechanism is released in the embodiment.

FIG. 6 is a perspective view showing a state in which a lock mechanism is operated to be in a locked state in the embodiment.

FIG. 7 is a block diagram illustrating a main part of a circuit configuration of the portable computer according to the embodiment.

FIG. 8 is a flowchart showing control at the time of first power-on after purchasing a portable computer.

FIG. 9 is a flowchart showing a work flow for temporarily releasing the lock in the anti-theft mode in which the lock mechanism operates.

FIG. 10 is a flowchart illustrating a state of control when the portable computer is taken away.

FIG. 11 is a flowchart showing a control flow for protecting the portable computer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Portable computer (small electronic device), 11 Computer main body 23 Battery 24, 25 Lock mechanism 27 LCD lock control circuit 28 Main body side infrared function part 33 Outside main body infrared function part 41, 42 Hook 46 Lock lever

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04Q 9/00 311 G06F 1/00 312S

Claims (4)

[Claims] An infrared receiving means for receiving infrared light transmitted from a predetermined transmitting source; and a circuit device when the infrared receiving means stops receiving infrared light transmitted from the predetermined transmitting source. Lock means for holding a lid portion, which is openably and closably disposed on a main body portion, in a closed state, and unlocking the lock means when a password input from the outside matches a preset value, and And a lock release means for opening and closing the electronic device. 2. An infrared receiving means for receiving infrared rays transmitted from a predetermined transmission source; an anti-theft mode setting means for setting the apparatus to an anti-theft mode for preventing theft; When the infrared receiving means stops receiving infrared light transmitted from the predetermined transmission source in the state of being set to the prevention mode, the lid portion which is openably and closably disposed on the main body portion housing the circuit device is closed. Lock means for holding a state, and unlock means for unlocking the lock means when the password input from the outside matches a preset value and opening and closing the lid part. Small electronic devices. 3. The small electronic device according to claim 1, wherein the externally input password is input by infrared rays from a portable remote controller. 4. A main body portion containing a circuit device is formed of a metal case having an opening portion opened in only one direction, and the lid portion is formed of a display having a structure for opening and closing this opening portion. The small electronic device according to claim 1 or 2, wherein: