JPH0462896A - Compact electronic device - Google Patents

Abstract

PURPOSE:To prevent a battery pack contained in a boxed battery pack containing part from dropping down even if holding of the battery pack by a holding means is released manually by holding the battery pack by engagement between a recessed part provided to the bottom of the battery pack and a reed provided to bottom of the battery pack containing part. CONSTITUTION:A battery pack 8 is inserted inside a battery pack containing part 10 from behind a box body 1. A pair of engagement projection pieces 31 of the battery pack 8 engage with an engagement hole 20 of the containing part 10, and a pair of engagement projection parts 28 engage with an engagement step 17. A pair of recessed parts 32 at a side part of the battery pack 8 engage with a pair of reeds 23 of a board member 22 provided to bottom wall of the containing part 10. While the battery pack 8 is inserted to the battery pack containing part 10, each elastic contact piece 19 positioned in a pair of holes 18 of a front wall 15 of the battery pack containing part 10 comes into contact with each electrode 30 provided to a pair of recessed parts 29 in a front surface of the battery pack 8. An engagement click part 34d of a bell crank 34 of a holding means is caught on an engagement projection 27 due to force of a spring 35 after rotation and fixes the battery pack 8 to the battery pack containing part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to small electronic devices such as portable laptop-shaped personal computers and word processors.

(Prior Art) Some small portable electronic devices are equipped with a keyboard at the front of a casing having a substantially rectangular planar shape, and a flat panel board between the keyboard and the rear of the casing. Various keyboards have been provided in which a display housing housing a keyboard is rotatably attached so that the keyboard is covered by the display housing when the display housing is closed.

In order to improve the portability of this type of small electrical equipment, the overall size of the equipment is made thinner, and a configuration is adopted in which the power source for the equipment is obtained from a battery pack.

The battery pack is detachably attached to a housing of a small electronic device for charging. For this reason, generally, a battery pack accommodating section provided in a housing is designed such that a two-part battery pack housing space is provided at the rear or side of the housing, and the portion of this space that is attached to the rear or side of the housing is opened. The entire battery pack is moved in and out of the space from the rear or side of the housing through the opening, and is housed in the space.

Conventionally, in order to connect the battery pack with the circuit provided inside the housing, an electrode was provided on the bottom of the battery pack, and an elastic contact that made elastic contact with the electrode was placed on the bottom of the battery pack housing. It is installed in the lower space and connected to the circuit board. Further, the battery pack accommodating portion and the battery pack are provided with means that can hold the battery pack accommodated in the battery pack accommodating portion in the accommodation position and release the holding by manual operation.

(Problem to be solved by the invention) However, recently in the above-mentioned type of small electronic devices, a device that drives a magnetic disk (floppy disk) for storing and recalling information is housed in a battery pack at the rear of the housing. It is being considered to install it below the section. That is, a floppy disk drive device loads and rotates a floppy disk, and uses a magnetic head to record and read information on the floppy disk.

When the floppy disk drive device is installed in this way, the contact for the battery pack and the floppy disk drive device are stacked one on top of the other in the space below the battery pack accommodating section at the rear of the casing. The thickness of the space below the battery pack accommodating section at the rear of the device becomes thicker, which in turn causes the casing to become a prototype.

Therefore, electrodes are provided around the edges of the battery pack, i.e., on the front or side surfaces, and elastic contacts are provided on the space facing the front or side surfaces of the battery pack accommodating part to make elastic contact with the electrodes of the battery pack. It is being considered whether to set one up. In this way, only the floppy disk drive device can be provided without providing an elastic contact in the space below the bottom surface of the battery pack accommodating portion.

However, with this configuration, the elastic contacts come into elastic contact with the electrodes of the battery pack and apply an elastic force to the battery pack in the direction of pushing it out from the opening formed on the rear or side surface of the battery pack accommodating part. There are cases.

By the way, the battery grasshopper accommodated in the battery pack accommodating portion is held at the accommodation position by the above-mentioned holding means. When the battery pack is taken out from the battery pack accommodating section, the holding of the battery pack by the holding means is released.

However, if the elastic contact is configured to apply elastic force to the battery pack in the direction of pushing it outward from the opening of the battery pack accommodating section, when the holding by the holding means is released by manual operation, the elastic contact will push the battery pack outward. There is a risk that the battery pack that has been pushed out will be pushed outward from the opening of the battery pack accommodating portion, and that the pushed-out battery pack will fall from the housing to the floor and be damaged.

The present invention has been made in view of the above-mentioned circumstances, and is a small electronic device that can prevent the occurrence of an accident in which the battery pack is inadvertently pushed out of the battery pack accommodating section and damaged when the battery pack is released from being held by the holding means. The purpose is to provide

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the small electronic device of the present invention has a housing having an opening for inserting and removing the battery pack on the rear or side surface of the housing. In the small electronic device provided with a battery pack accommodating portion, a recess is formed in the bottom of the battery pack, and the battery pack is placed in the opening by contacting an electrode provided on the battery pack. An elastic contact is provided to apply an elastic force in the direction of pushing out the battery pack, and a tongue piece having elasticity is provided on the bottom surface of the battery pack accommodating portion to engage with a recess in the bottom surface of the battery pack accommodated in the battery pack. Further, the battery pack and the battery pack accommodating section are provided with a holding means that can hold the battery pack accommodated in the battery pack accommodating section in the accommodation position and can release the holding by manual operation. It is characterized by the fact that

(Function) In addition to being held in the housing position by the holding means, the battery pack housed in the battery pack accommodating portion of the housing is held by the recess provided on the bottom of the battery pack and the tongue provided on the bottom of the battery pack accommodating portion. It is retained by engagement with the piece. For this reason, for example, in a configuration in which an elastic contact provided on the front surface of the battery pack accommodating portion is provided on the front surface of the battery pack, even if the retention by the holding means is released by manual operation, the recess of the battery pack and the battery pack accommodating portion are Due to the engagement with the tongue piece, the battery pack is held in the storage position and is not pushed outward from the battery pack storage section.

Further, the tongue piece provided on the bottom surface of the battery pack accommodating section can constitute a part of the bottom surface of the battery pack accommodating section, and the space inside the casing below this bottom surface is not utilized. Therefore, the floppy disk drive device can be provided below the battery pack accommodating portion of the casing without making the casing into a prototype.

(Example) Hereinafter, an example in which the present invention is implemented in a notebook type laptop personal computer shown in the drawings will be described.

In this embodiment, an opening for putting in and taking out the battery pack is provided at the rear of the battery pack accommodating part of the housing, an electrode is provided at the front of the battery pack, and an elastic contact is provided at the front of the battery pack accommodating part. It is something.

2 through 5 show the entire laptop-type personal computer. In the figure, reference numeral 1 denotes a synthetic resin casing having a substantially rectangular planar shape. This housing 1 is formed from a base portion 1a and a cover portion lb attached to the rear upper surface of the base portion 1a.
A keyboard 2 (see FIG. 5) is provided at the front of the computer. A printed wiring board (not shown) for the portable computer is housed therein.

A plurality of pivot parts 3 are integrally protruded from the cover part lb at intervals. A display housing 4 is rotatably attached to these pivots 3. That is, the display housing 4 integrally has a pivot protrusion 5 that is fitted between the pivot parts 3, and is rotatably connected to the pivot parts 3. Therefore, the display housing 4 attached to the rear of the housing 1 as described in ``2'' below.
can be rotated about the pivot point 3 to raise and lower it.

The housing 4 is formed in a size that covers the entire keyboard 2 when it is laid down and closed.

Note that when the display housing 4 is in the collapsed state, the elastically deformable hook portion 4a (third
5) can be held by being hooked into a locking groove 6 (see FIG. 5) formed on the front end surface of the housing 1. Furthermore, the display housing 4 is provided so as to be able to stand still at any opening angle by a friction adding mechanism (not shown) provided at the connection portion to the cover portion 1b.

The display housing 4 is formed by combining a pair of case members, and has a flat panel display 7 such as a liquid crystal display (see FIG. 5) inside.
is stored. This display 7 is exposed at the front surface of the housing 4 when the housing 4 is erected. Incidentally, a lead wire for connecting the display 7 and the printed wiring board is made through a connecting portion between the housing 4 and the cover part 1b.

As shown in FIG. 1, a horizontally long battery pack accommodating section 10 for storing a horizontally long battery pack 8 is provided in the upper part of the rear part of the housing 1, that is, in the rear part of the cover part 1b relative to the pivot part 3. , horizontally long battery pack accommodating portions 11 that accommodate horizontally long battery packs 9 are arranged side by side along the left-right direction of the housing 1 . In addition, a cover portion 1 is provided at the upper part of the rear part of the housing 1, that is, at the rear part of the base part 1a than the pivot part 3.
A floppy disk drive device (not shown) is provided below the battery pack storage section 1]O. This floppy disk drive device includes a mechanism for rotationally driving a floppy disk, a magnetic head for recording and reading information on the floppy disk, and the like.

A floppy disk insertion/extraction opening 12 is formed on the side surface of the base portion 1a for inserting and removing the floppy disk into and from the floppy disk drive device inside the base portion 1a. In this way, the housing 1 has a structure in which a floppy disk drive device is provided on the bottom surface of the battery pack housing section 8 by utilizing the space below.

The battery pack accommodating section 10 and the battery pack accommodating section 11 are each opened at the rear part of the housing 1 as an opening for taking in and taking out the battery pack, and the upper part is opened for auxiliary use. 0.11- is partitioned by a partition wall 13 formed upright on the cover part 1b.

1] The configurations of one battery pack housing section 10 and one battery pack 8 will be explained.

The battery pack housing section 10 will be explained. As shown in FIG. 1, the battery pack accommodating portion 10 has a rectangular parallelepiped-shaped space surrounded by four walls: a partition wall 13, which is a left side wall, a right side wall 14, a front wall 15, and a bottom wall 16. Furthermore, the rear part is open as an opening for inserting and removing the battery pack,
The top part is open for auxiliary use. Further, at the rear of each of the left and right side walls 13 and 14, a hook step 17 is formed to face each other. A pair of contact holes 18 are formed in the front wall 15 at intervals in the left-right direction.
The space inside the housing 1 located outside of the
As shown in FIGS. 7 and 9, a pair of elastic contacts 19 made of a copper alloy plate or the like are arranged opposite each contact hole 8. As shown in FIGS.

One of these elastic contacts is connected to the front wall 1 as shown in FIG.
The device is mounted on a circuit board 37 disposed in a space inside the cover part 1b located outside the cover part 5, and is electrically connected to a circuit formed on the circuit board 37, and a part of it is on the front wall] 5 into each contact hole 18 of the battery pack housing part 1.
It protrudes toward the 0 side. A pair of contact holes on the front wall 15]
A pair of engagement holes 20 are formed on the outside of 8 .

In addition, as shown in FIGS. 7 to 10, the bottom wall]-6
A laterally elongated opening 21 is formed in the center of the
In this open portion 21, a plate member 22 made of, for example, a stiff synthetic resin is arranged.

This plate member 22 has the same size as the open part 21, and a pair of tongue pieces 23 forming the same surface as the plate member 22 correspond to each contact hole 18 of the front wall 15 with an interval left and right. It is formed in the position shown. The pair of tongues 23 are along the front-rear direction, and the rear end is continuous with the plate member 16, and the other peripheral portion has a vertical plate surface and a rear surface that is an inclined surface that descends toward the rear. There is. and Figures 9 and 10.
As shown in the figure, this plate member 22 has a mounting portion 24 formed on its lower surface and a boss 25 formed on the lower surface of the bottom surface portion 16.
The screw 26 is tightened and fixed.

Furthermore, it is in the rear part of the bottom wall 16.

Note that the tongue piece 23 provided on the bottom surface of the battery pack accommodating section 10 can constitute a part of the bottom wall 16 of the battery pack accommodating section 10, and the space inside the casing 1 below this bottom wall 16 can be utilized. There is no. Therefore, without making the housing 1 into a prototype, the battery pack accommodating portion 1 in the housing 1 can be
A floppy disk drive can be provided below the 0.

The battery pack 8 will be explained. The battery pack 8 is rechargeable and serves as a power source for this personal computer, and is detachably inserted into and taken out of the battery pack accommodating portion 10 from the rear through an opening on the rear surface.

That is, as shown in FIGS. 1 to 4, this battery pack 8 has a rectangular parallelepiped shape of the same size as the battery pack accommodating portion 10. As shown in FIGS. Engagement protrusions 28 are integrally formed on both side surfaces of the battery pack 8 to engage with the engagement step 17 in a removable manner. A pair of electrode recesses 29 are formed on the front surface at intervals in the left-right direction, facing the elastic contacts 19 of each contact hole 18 provided in the battery pack accommodating portion 10. An electrode 30 is attached to each. A pair of left and right engagement protrusions 31 are integrally provided on the front surface of the battery pack accommodating portion 10 to face the pair of engagement holes 2°. Furthermore, on the bottom of this battery pack 8, a seventh
As shown in FIGS. 9 to 9, a plate member 2 is provided in the battery pack accommodating portion 10 with a pair of recesses 32 spaced apart from each other in the left and right direction.
It is formed to face each tongue piece 23 of No. 2. Note that an electrode 33 is attached to the recess 32.

In addition, a battery pack accommodating portion 10 is provided in the center of the battery pack 8.
A mechanism is provided which, in combination with the latching protrusion 27, constitutes a means for maintaining the state of attachment to the battery pack accommodating portion 10. As shown in FIGS. 6 and 11, this includes a bell crank 34 rotatably attached to the battery pack accommodating portion 1o, and a spring 35 that biases the crank 34.

The side surface of the bell crank 34 has an abbreviated shape,
The central portion thereof has a shaft portion 34a that is the center of rotation. One end side portion of this bell crank 34 is connected to the battery pack 8.
The operating section 34b extends from the rear surface to the upper surface of the operating section 34b. Note that the outer surface of the operating portion 34b is grooved to prevent slipping, and the operating portion 34b is provided on the same surface as the outer surface of the rear surface of the battery pack 8. Furthermore, the other end side portion 34 of the bell crank 34
c extends substantially perpendicularly to the operating portion 34b, and an engaging claw portion 34d that engages and disengages from the engaging protrusion portion 27 is integrally formed in this portion 34c. The spring 35 is a torsion coil spring. The spring 35 has one end in contact with the ceiling surface of the battery pack 8 and the other end in contact with the upper surface of the other end portion 34c, and biases the other end portion 34c downward. are doing.

Further, an opening 36 is provided on the lower surface of the battery pack 8 to expose the other end portion 34c, and the other end portion 34c is pressed against the front edge 36a of the opening 36. There is.

A case where the battery pack 8 is loaded into the battery pack housing section 10 will be described.

Then, the operator manually inserts the battery pack 8 into the battery pack accommodating part 10 from the rear of the housing 1 through the rear opening of the battery pack accommodating part 0 as shown in the direction of arrow A in FIG. The battery pack 8 is housed in the power pack housing 10 with the front, both ends, and bottom facing the partition wall 13, side wall 14, front wall 15, and bottom wall 16 of the battery pack housing 10. Here, a pair of engaging protrusions 31 of the battery pack 8
are engaged with the engagement holes 20 of the accommodating portion 10, respectively, and the pair of engagement protrusions 28 are engaged with the engagement step portions 17, respectively. Furthermore, the pair of recesses 32 on the bottom of the battery pack 8 are connected to the housing section 10.
It engages with a pair of tongue pieces 23 of the plate member 22 provided on the bottom wall. That is, in the process of inserting the battery pack 8 into the battery pack accommodating portion 10, the front edges of the pair of recesses 32 touch the pair of tongue pieces 2.
It moves on the inclined rear surface of the protrusion 23a of No. 3 and reaches the flat upper surface. As a result, the pair of tongue pieces 23 are attached to the battery pack 8.
The battery pack 8 is pushed by the bottom surface and elastically deforms downward to allow the battery pack 8 to pass through. The front edge of the pair of recesses 32 is the pair of tongue pieces 2
3, the pair of tongues 23 are pushed by the bottom surface of the battery pack 8 and are elastically deformed upward, causing the protrusion 23a to enter the recess 32. The front surface of the recess 32 engages with the vertical front surface of each protrusion 23a. In addition, a pair of tongue pieces 2
The height of the protrusion 23a of No. 3 is the height of the protrusion 23a and the recess 32.
The front edge of the battery pack 8 can be lightly engaged with the front edge of the battery pack 8 to prevent the battery pack 8 from coming out of the battery pack housing section 10 .
When pulled toward the outside of the battery pack housing part 10 by hand, the front surface of the protrusion 23a and the front edge of the recessed part 32 are disengaged, and the height is such that the battery pack can be pulled out to the outside of the battery pack housing part 10.

Further, each elastic contactor 19 located in the pair of holes 18 in the front wall 15 of the battery pack housing section 10 contacts each electrode 30 provided in the pair of recesses 29 on the front surface of the battery pack 8 . Each elastic contactor 19 contacts each electrode 30 with an elastic force, and applies an elastic force toward the rear of the battery pack 8.

In addition, as described above, the battery pack 8 is inserted into the battery pack housing section 1.
0, the bell crank 34 of the holding means is
After being rotated as shown by the dashed line in the figure, the engagement claw portion 34d is hooked onto the engagement protrusion 27 by the force of the spring 35 as shown by the solid line in FIG. This fixes the battery pack 8 to the battery pack accommodating part 10 and prevents it from being pulled out rearward from the battery pack accommodating part 10.

Therefore, the battery pack 8 is loaded into the battery pack accommodating portion 10 with its movement in the left-right direction and upward movement restricted.

It also has the role of switching the circuit that is connected to the specification according to the magnitude of the current value of the specification of the battery pack 8. That is, as shown in FIG. 12, elastic contacts 38 are attached to the circuit board 37 in correspondence with the latching holes 20 of the cover part b. One end of the elastic contactor 38 is connected and fixed to a component of a circuit provided on the circuit board 37, and the other end comes into contact with and separates from a contact 39 provided in a circuit of the circuit board 37. The circuit of the circuit board 27 is switched to correspond to a current of, for example, 1700 mA when the elastic contact 38 is away from the contact, and to correspond to a current of 2000 mA when it is in contact. The current value of the battery pack 8 varies depending on its capacity, and the engaging protrusion 30 varies depending on the magnitude of the current value.
The lengths of the protrusions 30 are different, and when the current value is large, the protrusion 30 becomes long. In this embodiment, the battery pack 8 has a current value of 2000 m
In case A, the protruding piece 30 is longer than that of 1700 mA. When the battery pack 8 is loaded into the battery pack accommodating portion 10 and inserted into the engagement hole 20 to protrude into the cover part 1b, the elastic contacts 38 are pushed by the cover part lb and are elastically deformed, causing the circuit board 3
contact point 39 of.

In this installation state, the top and rear surfaces of the battery pack 8 are exposed as shown in FIGS. 2 to 4, and the housing 1 is
It forms a part of the rear upper surface and the rear surface of, and is flush with these. Furthermore, the top surface of the battery pack 8 is flush with the top surface of the housing 4 in the closed state.

Furthermore, a case in which the battery pack 8 is removed from the battery pack accommodating section]O will be described. First, the engagement of the retaining means with the latching protrusion 18 is released by an operation opposite to the above-described attachment operation. Here, protrusions 23a are formed on the pair of tongues 23 of the plate member 22 provided on the bottom wall 16 of the battery pack accommodating portion 10 in the pair of recesses 32 on the bottom surface of the power pack 8.
are engaged to prevent the battery pack 8 from moving toward the rear opening of the battery pack accommodating portion 10.

Therefore, after the engagement with the engagement protrusion j in the holding means is released, the battery pack 8 is moved and placed in the battery pack housing section 1.
0 can be prevented from falling outward from the rear opening. That is, in the past, the pair of recesses 3 on the bottom of the hook 8 were
2 and the bottom wall of the battery pack accommodating portion 10] Since there was no structure for engaging the pair of tongues 23 of the plate member 22 provided on the bottom wall of the battery pack storage portion 10, the engagement with the engagement protrusion 27 of the holding means was described above. If the battery pack 8 is released by performing the opposite operation to the installation operation, the battery pack 8 cannot be temporarily held in the battery pack accommodating part 10, and the battery pack 8 may be accidentally moved and damaged. There have been many accidents where the 10 has fallen from the rear opening and been damaged. Therefore, the engaging protrusion 2 in the holding means
Even after the battery pack 8 is released from the battery pack 7 by an operation opposite to the above-described installation operation, the battery pack 8 can be handled with confidence, resulting in high reliability and safety.

After that, when the battery pack 8 is tilted slightly upward with its rear part and pulled strongly backwards, each recess 32 and each tongue piece 23 are disengaged and can be easily removed from the battery pack housing 10. can.

As a result, this embodiment solves the problem that the battery pack 8 may be inadvertently moved from the battery pack accommodating portion 10 when the engagement of the battery pack 8 by the manually operable holding means is released. Thus, the elastic contactor 18 can be provided on the front side of the battery pack housing section 10. Below the battery pack accommodating portion 10, a floppy disk drive device is simply provided. Also, battery pack housing]
It is also possible to provide the elastic contactor 18 on the end face side of 0.

The other battery pack accommodating section 1 that accommodates the battery pack 9 has a rectangular parallelepiped shape with an open top and rear surface. For example, as shown in FIG. 1, the battery pack accommodating part 11 has a pair of holes 40 in its front wall, similar to the one battery pack accommodating part 0, and is arranged in a space inside the casing in front of this front wall. A pair of elastic contacts 41 are provided facing the hole 40. A screw hole 42 is provided in the rear surface of the battery pack housing section 1.

Further, the battery pack 9 has a rectangular parallelepiped shape having the same size as the battery pack housing portion 11. The front face of the battery pack 9 is provided with electrodes (not shown) that contact the pair of elastic contacts 41 of the battery pack accommodating portion 11, and the rear face is further provided with screw fixing pieces 43.

Then, the battery pack 9 is loaded into the battery pack accommodating part 11, the electrode is connected to the elastic contact, the screw piece 43 is aligned with the screw hole 42, and the screw 44 is screwed in and tightened. The battery pack 9 is placed in the battery pack housing section 11.
It can be fixed to

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications.

For example, instead of installing two battery packs side by side in the housing, one
Only one battery pack may be provided.

Further, the positions where the electrodes of the battery pack and the elastic contacts of the battery pack housing part are provided are not limited to the front side of the battery pack and the battery pack housing part as in the embodiment.

The opening for taking in and taking out the battery pack in the battery pack accommodating part is not limited to the front part of the accommodating part, but can also be provided in the side part.

[Effects of the Invention] As explained above, according to the small electronic device of the present invention, the battery pack accommodated in the battery pack accommodating portion of the casing is placed between the recess provided on the bottom surface of the battery pack and the bottom surface of the battery pack accommodating portion. In a configuration in which the battery pack is provided on the peripheral edge side of the battery pack housing portion in order to be held by engagement with the provided tongue piece,
Even if the holding of the battery pack by the holding means is released by manual operation, the battery pack can be held in the storage position and prevented from falling outward from the battery pack storage part, thereby improving safety and reliability. I can do it.

The tongue piece provided on the bottom surface of the battery pack accommodating portion can constitute a part of the bottom surface portion of the battery pack accommodating portion, and the space inside the casing below the bottom surface portion is not utilized. Therefore, the floppy disk drive device can be provided below the battery pack accommodating portion of the casing without making the casing into a prototype.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a laptop-type personal computer, in which FIG. 1 is an enlarged perspective view of a battery pack and a battery pack accommodating section, FIG. 2 is a rear view of the whole, and FIG. Overall plan view, Figure 4 is A in Figure 2
5 is a perspective view of the entire day play housing in an open state, FIG. 6 is a bottom view of the battery pack, and FIGS. 7 to 10 are a view of the recess of the battery pack and The combination with the tongue piece of the battery pack accommodating part is shown, and Fig. 7 is a side view, Fig. 8 is a rear view, Fig. 9 is an enlarged side view, Fig. 10 is a bottom view, and Fig. 11 is a holding part. FIG. 12 is a sectional view showing the means for changing the connection of the wiring board depending on the magnitude of the current value. DESCRIPTION OF SYMBOLS 1... Housing, 2... Keyboard, 7... Flat panel display, 4... Display housing, 89... Battery pack, 10.11... Battery pack housing part,] 9 ... Elastic contact, 23 ... Tongue piece, 30
...electrode, 32...recess. Applicant's agent Patent attorney Takena Suzue

Claims (1)

[Claims] In a small electronic device in which a casing is provided with a battery pack accommodating part having an opening for inserting and removing the battery pack on the rear or side surface of the casing, a recess is formed in the bottom of the battery pack, and the battery pack is The accommodating portion is provided with an elastic contact that contacts an electrode provided on the battery pack and applies elastic force in a direction to push the battery pack out of the opening, and a bottom surface of the battery pack accommodating portion is provided with an elastic contact that applies an elastic force in a direction to push the battery pack out of the opening. A tongue piece having elasticity that engages with a recess in a bottom surface of the battery pack housed in the battery pack is provided, and the battery pack and the battery pack housing part are further provided with a tongue piece having elasticity that engages with a recess in the bottom surface of the battery pack housed in the battery pack housing part. What is claimed is: 1. A small electronic device, characterized in that it is provided with a holding means that holds the electronic device in a housed position and can be released from the holding by manual operation.