JP2002026534A - Unit case structure of memory drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose the unit case structure of a memory drive unit that is seamless and has an excellent radiation property. SOLUTION: A unit case 2 of the MO drive unit 1 is composed of a cylindrical case body 10 that is an aluminum extrusion molding, a plastic front frame 20 that is mounted to a front opening 12, and a plastic rear frame 30 that is mounted to a rear opening 13. In the inside, a chassis 5 where each part is mounted is fitted. A pair of upper and lower leaf springs 9 and 9 prevents clattering in the chassis 5, where the pair is arranged between the chassis 5 and the side walls 14 and 15 of the body 10. By the spring force of a leaf spring member, the chassis 5 adheres to contact surfaces 151 a and 152a for radiation on the side wall 15, thus fitting the chassis into the case body being the aluminum extrusion molding without any clattering, and also achieving the superior radiation property in the unit case since the case body adheres to the chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit case structure of an external memory drive unit for reproducing and recording on a recording medium such as an MO.

[0002]

2. Description of the Related Art In personal computers and the like,
An external memory drive unit is used for reproducing and recording on a recording medium such as an MO. Such a memory drive unit has a structure in which a chassis is housed in a unit case, and drive components such as a pickup and a motor are mounted on the chassis.

Here, the unit case generally has a two-piece structure made of a plastic molded product. That is, the case body and the case lid are molded as plastic molded articles, and they are combined with each other and fastened and fixed with fixing screws or the like.

[0004]

In the case of such a two-piece structure, a joint between the case body and the case lid appears on the outer surface of the unit case, which is not preferable from an aesthetic point of view. It is sufficient to form a seamless one-piece unit case, but a one-piece unit case cannot be formed by plastic injection molding.

In the case of a unit case made of plastic, since its heat dissipation is poor, heat generated by the built-in components, particularly heat generated by a power supply circuit, a switching FET, a motor, etc., is discharged to the outside. It is necessary to provide a fan, a heat sink, and the like. Providing such a heat dissipation mechanism increases the cost and size of the unit.

SUMMARY OF THE INVENTION The object of the present invention is to provide a unit case structure of a memory drive unit in which the case body of the unit case is seamless.

Another object of the present invention is to propose a unit case structure of a memory drive unit having excellent heat dissipation.

[0008] Further, the object of the present invention is to provide excellent heat dissipation.
An object of the present invention is to propose a unit case structure of a memory drive unit that can be configured to be small and compact.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a unit case structure of a memory drive unit for reproducing and recording a recording medium, comprising a cylindrical case body and a front opening of the case body. A front frame attached to a rear opening of the case main body, and a chassis on which components of the memory drive unit housed inside the case main body are mounted. It is characterized by being an extruded aluminum product.

In the unit case structure of the memory drive unit of the present invention, since the case body is an extruded aluminum product, the cylindrical case body can have a seamless one-piece structure.

Here, when the cylindrical case body is made of an extruded aluminum product, it is difficult to achieve the target dimensional accuracy. Therefore, in the present invention, the vertical or horizontal movement of the chassis in the case body is restricted by the elastic return force of the spring member using the spring member attached to the chassis. By using the spring member, even if the dimensional accuracy of the case main body varies, it is possible to suppress rattling of the chassis housed therein.

Generally, the case body is a vertically long, flat rectangular tube. In this case, the dimensional accuracy between the wide left and right side surfaces is likely to deteriorate. Therefore, the right and left movement of the chassis may be restrained by the spring member to prevent left and right rattling.

Next, the front frame and the rear frame may be plastic molded products.

On the other hand, when the case body is made of aluminum, the heat dissipation of the case body is good, so that the case body is provided with a heat-dissipating chassis contact surface which can make surface contact with the chassis. What is necessary is just to form a state in which the chassis is pressed against the heat-radiating chassis contact surface by the elastic return force of the member. With this configuration, the internal heat can be efficiently released to the outside through the chassis and the case body, so that a cooling fan, a heat radiating plate, and the like need not be disposed, and the unit can be manufactured small, compact, and inexpensively. .

Next, in the present invention, the front frame includes a frame main body having a frame shape corresponding to a front opening of the case main body, a snap-fit engaging portion integrally formed with the frame main body, A configuration having a contact surface integrally formed with the frame body and capable of contacting an end surface of the front opening,
If the chassis has a front end portion with an engagement portion capable of forming a snap-fit portion between the front frame and the engagement portion of the front frame, the front frame is moved relative to the front end portion of the chassis. You can snap-fit with one touch.

In this case, if a snap fit portion between the front frame and the chassis is formed on the upper and lower sides or the left and right sides of the case main body, the chassis is mounted on the front frame attached to the main body case without play. The front end of the main body is fixed, so that it is possible to prevent rattling of the chassis in the main body case.

Next, the rear frame includes a frame body having a frame shape corresponding to a rear opening of the case body, and a contact surface integrally formed with the frame body and capable of contacting an end surface of the rear opening. , And a screw hole, the chassis,
If the rear end has a screw hole, the rear frame can be screwed to the rear end of the chassis.

Next, the unit case structure of the memory drive unit of the present invention has a self-supporting leg detachably attached to the lower surface of the main body case. And left and right side portions standing upright from the left and right sides of the leg main body, and engaging protrusions or concave portions formed on the inner surfaces of these side portions, and the left and right side surfaces of the main body case include: A concave portion or a convex portion engageable with an engaging convex portion or a concave portion formed on the leg extends in the front-rear direction.

According to this configuration, by attaching and detaching the legs, the memory drive unit can be easily used in any of the vertical and horizontal positions.

Next, the unit case structure of the memory drive unit of the present invention has a name plate detachably attached to a side surface of the main body case, and the main body case has a front opening or a rear side. An insertion groove into which the name plate can be inserted from an opening is provided.The name plate includes a plate main body slidably inserted into the insertion groove, and a plate fixing portion formed at one end of the plate main body. An engaging projection is formed on one of an inner surface of the plate fixing portion and an outer surface of the front frame or the rear frame opposed to the plate fixing portion, and an engaging concave portion is formed on the other. It is characterized by:

According to this configuration, if a plurality of name plates of different colors are prepared, the name plates can be easily exchanged according to the user's request, which is convenient.

In this case, a taper whose width or thickness gradually increases toward the plate fixing portion is provided on both side edge portions of the plate body facing the groove side surface of the insertion groove and connected to the plate fixing portion. It is desirable that a portion is formed. By doing so, it is possible to reliably prevent the inserted name plate from rattling or coming off.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a unit case of a memory drive unit to which the present invention is applied will be described with reference to the drawings.

(Overall Configuration) FIG. 1 shows an MO to which the present invention is applied.
FIG. 2 is an external perspective view showing the drive unit, and FIG. 2 is an exploded perspective view of a main part thereof. With reference to these figures, the memory drive unit 1 of the present example has a unit case 2 having a vertically long and flat rectangular parallelepiped shape as a whole, and is detachably mountable on the lower surface of the unit case 2 at two front and rear portions. In this state, a pair of legs 3 is attached.
A name plate 4 inserted in a detachable manner is attached to one side surface of the unit case 2.

Inside the unit case 2, the chassis 5
A drive unit body 6 (see FIG. 2) having a configuration in which drive components such as a pickup, a power supply circuit, and a motor are mounted.
Is shown with imaginary lines. ) Is attached. At the front end of the drive unit body 6, a slot 7 for MO insert and eject is exposed, and an eject button 8 for MO eject is located at a lateral position above the slot 7.

The unit case 2 of this embodiment has a vertically long, flat, rectangular cylindrical case body 10, a front frame 20 attached to a front end opening 12 of the case body 10, and a rear end opening 13.
And a frame 30 attached thereto. The case body 10 is made of an extruded aluminum product and has a front frame 20.
The rear frame 30 is made of a plastic molded product.

Here, when the rectangular cylindrical case main body 10 is an extruded product of aluminum, it cannot be generally formed with high dimensional accuracy. In particular, the interval between the central portions of the left and right wide side wall portions 14 and 15 in the case main body 10 cannot be accurately defined. For this reason, there is a high possibility that the chassis 5 housed in the case body 10 will rattle left and right. Therefore, in this example, between the chassis 5 and the case body 10,
Even when the dimensional accuracy of the case body 10 varies, the chassis 5
To prevent rattling on the left and right.

(Chassis rattling preventing mechanism) FIG. 3 is a view showing a left and right rattling preventing mechanism of the chassis 5 in the unit case 2 of this embodiment. With reference to FIGS. 2 and 3, the rattling prevention mechanism on the left and right sides of the chassis 5 will be described in detail. First, the chassis 5 is composed of a chassis main body 51 and a rear plate 52 attached to the rear end thereof. The chassis main body 51 is bent laterally from the bottom plate portion 53 extending vertically and the upper and lower edges. Upper and lower side plate parts 5
It has a U-shaped cross section consisting of 4, 55.

A shallow U-shaped notch is formed at the edge of the upper and lower side plate portions 54 and 55 at the center of the unit case in the front-rear direction.
Has been fixed. The leaf spring member 9 includes an L-shaped attachment portion 91 fixed to the upper and lower side plate portions 54 and 55 by caulking, and a vertical plate portion of the attachment portion 91 from the inner surface of the unit case side wall portion 14. A leaf spring 92 is provided that projects obliquely. This leaf spring 9
A projection 93 is formed at the tip end of the projection 2 to contact the inner surface 14a of the side wall portion 14.

On the other hand, the other side wall portion 15 of the case body 2
Are formed with thick portions 151 and 152 having a constant width above and below, and the inner surface 1 of these thick portions 151 and 152 is formed.
51a and 152a are the bottom plate portion 53 of the chassis body 51.
Is a flat heat dissipating contact surface that can be in surface contact with the back surface.

When the chassis 5 having this structure is inserted into the case body 5 which is an integral body made of aluminum, for example, through the front opening 12 thereof, the plate springs 9 and 9 mounted on the upper and lower sides of the chassis 5 The spring 92 is shown in FIG.
At the time, the state becomes elastically deformed as shown by the solid line. As a result, the elastic return force of the leaf spring 92 causes the chassis 5
Are pressed against the inner surfaces 151a and 152a of the side wall portion 15 of the case body in this example. As a result, the chassis 5 is housed in the case main body without rattling, and the bottom plate portion 53 comes into close contact with the heat-radiation contact surfaces 151a, 152a.

Therefore, in the present embodiment, even if the distance between the left and right side wall portions 14 and 15 of the case main body 5 varies, the chassis 5 is not loosened by the pair of leaf spring members 9 and 9. 10 can be inserted.

In this embodiment, the heat radiation contact surfaces 151a and 152a are formed on the side wall portion 15, and the chassis bottom plate portion 53 is brought into close contact with the contact surface by the leaf spring 92. As a result, the heat generated from the heat source components mounted on the chassis is transmitted from the chassis 5 to the aluminum side wall portion 15 and is released to the outside. Therefore, heat can be efficiently dissipated,
There is no need to arrange a cooling fan, a heat radiating plate, and the like in the unit case 2, and the unit 1 can be manufactured small, compact, and inexpensively.

Next, as can be seen from FIG. 2 and FIG. 9 showing the front frame 20, the plastic front frame 20 attached to the front opening 12 of the aluminum case main body 10 is connected to the front opening of the case main body. The frame main body 21 has a frame shape corresponding to the frame 12, and the frame main body 21 has a frame-shaped contact surface 22 that can be in contact with the front opening end surface 121.
From the contact surface 22, insertion ribs 23, 24, 2
5 project toward the rear of the unit case. The outer surface on the base side of each of the insertion ribs 23, 24, 25 is a tapered surface that spreads outward.

An upper plate portion 231 of the upper insertion rib 23 has a pair of left and right snap-fit engagement claws 26, 2 formed by separating the upper portion.
6 are formed, and the tips of the engaging claws 26, 26 protrude more than the tips of the insertion ribs 23 and are projected downward. Similarly, a pair of right and left snap-fit engagement claws 27, 27 formed by separating the lower plate portion 241 of the lower insertion rib 24 are formed on the lower plate portion 241. The distal end protrudes from the distal end of the insertion rib 24 and is in an upwardly convex state.

On the other hand, as can be seen from FIG. 2 and FIG. 7 showing the chassis main body, the front ends of the upper side plate portion 54 and the lower side plate portion 55 of the chassis main body 51 are respectively provided with snap-fitting members. A pair of left and right engagement holes 541 and 541 into which the dowel 26 is fitted, and a pair of left and right engagement holes 55 into which the snap-fit engagement claws 27 are fitted.
1, 551 are formed.

Accordingly, when the front frame 20 is pushed into the front opening 12 of the case body 10 toward the rear of the unit case, the insertion ribs 23, 24,
The frame-shaped contact surface 22 comes into contact with the front opening end surface 121. Insert ribs 23, 2
Since the outer surfaces of 4 and 25 are tapered, even if the dimensional accuracy of the front opening 12 of the aluminum main body case 10 varies, the plastic front frame 20 is smoothly inserted into the front opening 12. be able to.

When the front frame 20 is inserted, the engagement claws 26 and 27 for snap fitting at the upper and lower sides thereof are pushed up and down, and the upper and lower side plate portions 54 and 5 of the chassis main body are spread.
5 is moved along the inclined surfaces 542 and 553 formed in 5 and fitted into the engaging holes 541 and 551 formed in these by elastic force. As a result, front frame 2
0 can be fixed to the front end of the chassis with one touch.

Next, as can be seen from FIG. 2 and FIG. 10 showing the rear frame, the rear frame 30 is provided with a frame body 31 having a frame shape corresponding to the rear opening 13 of the case body 10. The main body 31 has a frame-shaped contact surface 32 that can contact the rear opening end surface 131. From this contact surface 32, insertion ribs 33, 34, 35 protrude toward the front of the unit case. Each insertion rib 33, 34, 3
The outer surface on the root side of 5 is a tapered surface that spreads outward.

A screw hole 36 for fixing is formed at a corner of the upper insertion rib 33.
Similarly, a screw hole 37 for fixing is formed in the lower corner of the insertion rib 34 at the opposite corner.

On the other hand, as shown in FIGS. 2 and 7, the rear ends of the upper side plate portion 54 and the lower side plate portion 55 of the chassis main body 51 have screw holes 36 and 37, respectively.
The fixing screw holes 543 and 553 are formed at the positions corresponding to.

Therefore, when the rear frame 30 is pushed into the rear opening 13 of the main body case 10 toward the front of the unit case, the insertion ribs 33, 3 are inserted into the rear opening 12.
4 and 35 are fitted, and the frame-shaped contact surface 32 is in contact with the rear opening end surface 131. Rib for insertion 3
Since the outer surfaces of 3, 34 and 35 are tapered surfaces,
Even if the dimensional accuracy of the rear opening 13 of the aluminum main body case 10 varies, the plastic rear frame 30 can be smoothly inserted into the rear opening 13.

The rear frame 30 is provided with a pair of upper and lower fixing screws 3.
8, 39 screwed to the rear end of the chassis.
Here, since the front frame 20 is snap-fitted to the front end of the chassis, when the rear frame 30 is screwed, the case body 10 is sandwiched, and the front frame 20 and the rear frame 30 are securely fixed to the case body 10. Is done. As a result, the chassis 5 to which the front frame 20 and the rear frame 30 are attached is fixed at a predetermined position in the case body.

As described above, in this embodiment, the front frame 20 is fixed to the front end of the chassis 5 in a snap-fit manner,
0 is screwed to the rear end of the chassis 5. Therefore, the front frame 20 and the rear frame 30 can be securely fixed to the main body case 10, and the chassis 5 can be reliably held at the fixed position in the case main body without rattling.

As described above, in the unit case 2 of this embodiment, the rattling of the chassis 5 mounted inside the main body case 10 made of aluminum, particularly the rattling of the left and right, is reduced by the pair of leaf spring members 9 and 9. It is prevented by. Therefore, even if the dimensional accuracy of the main body case 10, which is an extruded aluminum product, varies, the chassis 5 does not rattle.

(Leg Mounting Structure) Next, a pair of front and rear legs 3 and 3 mounted on the lower surface of the unit case 2 and the mounting structure thereof will be described with reference to FIGS. 1, 2 and 5. The leg 3 is a molded plastic product and includes a bottom plate portion 301 and a pair of left and right side plate portions 302 and 303 projecting upward from both ends. Side plate part 30
Projections 304 and 305 protruding inward are formed on the inner side surfaces of the upper ends of the two and 303. The space between the pair of left and right side plate portions 302 and 303 is set to a size that allows the lower portion of the unit case 2 to be fitted.

On the other hand, in the lower part of the unit case 2 to which the legs 3 are attached, that is, in the lower part of the case body 10, the outer surfaces of the left and right side wall parts 14, 15 are directed in the unit case front-rear direction. And uneven surfaces 143 and 153 extending in parallel at regular intervals. When the leg 3 is pushed into the lower portion of the main body case 10, the projections 304 and 404 at the ends of the left and right side plate portions are exactly on the uneven surface 1.
43, 153 are fitted in the lowermost concave grooves 144, 154. In this state, the leg 3 does not come off the unit case 2 and can slide in the front-rear direction of the unit case 2.

In this embodiment, the upper and lower portions of the case body 10 are also formed with uneven surfaces 143 and 153 on the outer surfaces of the left and right side wall portions 14 and 15, and the legs 3 are turned upside down. It is also possible to attach.

(Nameplate Mounting Structure) Next, the structure of the nameplate 4 and its mounting mechanism will be described with reference to FIG. 1, FIG. 2 and FIG. Nameplate 4
Is a plastic plate having a fixed thickness and a fixed width, and includes a plate main body 41 and a plate fixing portion 42 continuous with the front end. The upper and lower end faces of the plate body 41 are cut out in L-shape to form thin rail portions 43 and 44. Tapered surfaces 43a, 44a whose thickness gradually increases toward the plate fixing portion are formed at ends of the rail portions 42, 43 on the plate fixing portion 42 side. A pair of upper and lower protrusions 42a, 42a are formed on the inner surface of the plate fixing portion 42.

On the other hand, on the outer surface of the side wall portion 14 of the case body 10 of the unit case 2, a plate insertion groove 145 extending in the unit case front-rear direction is formed at an intermediate position in the vertical direction. The plate insertion groove 145 is set to have a cross-sectional shape that allows the plate main body 41 of the name plate 4 to be inserted from the front end thereof.

When the name plate 4 is inserted, the insertion groove 21a of the fixing portion 42 is formed on the side surface of the front frame 20 facing the projections 42a formed on the inner surface of the plate fixing portion 42. Is formed. In addition to this, on the bottom surface of the insertion groove 21a,
Engagement recesses 21b at positions corresponding to the projections 42a, 42a,
21b is formed.

The name plate 4 is inserted from the front side of the unit case 2 into the insertion groove 21 formed in the front frame 20 thereof.
a into the insertion groove 145 of the main body case 10, the projections 42 a of the plate fixing portion 42
It fits into the recesses 21b, 21b on the front frame side. Also, the tapered surfaces 43a and 44a formed on the upper and lower sides of the plate body are
It fits into the front end of the insertion groove 145 of the main body case 10. As a result, the name plate 4 is inserted and fixed in the unit case 2 without play.

[0053]

As described above, in the unit case structure of the memory drive unit according to the present invention, before the unit case is attached to the cylindrical case main body made of an extruded product made of aluminum and the front and rear openings thereof. It consists of a frame and a rear frame. Therefore, a seamless unit case can be realized.

Further, in the present invention, there is provided a mechanism for preventing rattling of a chassis housed in a case body which is an extruded product made of aluminum. Therefore, even if there is a large variation in the dimensional accuracy of the case main body, the chassis can be mounted on the main body case without rattling.

Further, in the present invention, the front frame is inserted into the front end opening of the main body case, and the front frame is inserted and fixed to the built-in chassis by a snap fit method. The frame is inserted and fixed to the built-in chassis by screwing. Therefore, the rattling prevention mechanism of the chassis can be easily configured, and the front frame and the rear frame can be easily assembled to the case body.

In addition to the above, according to the present invention, a state in which the chassis is brought into surface contact with the aluminum case main body by using a spring member incorporated in the case main body to prevent rattling of the chassis. Has formed. Therefore, heat generated by the components mounted on the chassis can be efficiently released from the chassis to the outside via the case body. Therefore, there is no need to attach a cooling fan, a heat radiating plate, and the like, and the unit can be made compact, compact, and inexpensive.

Next, in the present invention, since the legs are detachably mounted and slidable back and forth on the unit case, advantages such as easy adjustment of the mounting position are obtained.

Further, in the present invention, since the name plate is detachably attached to the unit case, there is also obtained an advantage that the name plate can be easily replaced as desired by the user.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an example of an MO drive unit to which the present invention is applied.

FIG. 2 is an exploded perspective view showing the unit of FIG. 1 in an exploded manner.

FIG. 3 is a partial cross-sectional view showing a left and right rattling preventing mechanism of the chassis in the unit case of FIG. 1 and a partial cross-sectional view taken along line 3B-3B.

FIG. 4 is a sectional view showing a mounting structure of a front frame and a rear frame in the unit case of FIG. 1 and a partially enlarged sectional view thereof.

FIGS. 5A to 5D are a plan view, a side view, a cross-sectional view, and a leg showing the legs attached to the unit case of FIG. 1;
It is explanatory drawing which shows the attachment structure with respect to a case main body.

6 (a) to 6 (d) are partial front views of the name plate attached to the unit case of FIG. 1, and FIG.
It is the fragmentary sectional view of the part cut | disconnected by 6B line, the fragmentary sectional view of the part cut | disconnected by 6C-6C line, and the fragmentary side view.

7 (a) to 7 (e) are a front view, a plan view, a rear view, a front side view and a rear side view showing a chassis main body in the chassis incorporated in the unit case of FIG. 1;

FIG. 8 is a front view, a plan view, a back view, and a side view showing a rear plate of a chassis built in the unit case of FIG. 1;

9 (a) to 9 (e) are a front view, a right side view, a left side view, a rear view, and a vertical sectional view of a front frame constituting the unit case of FIG.

10A to 10E are a front view, a right side view, and a rear view of a rear frame constituting the unit case of FIG. 1;
It is a longitudinal section, left side view.

[Explanation of symbols]

 Reference Signs List 1 MO drive unit 2 Unit case 3 Legs 302, 303 Side plate portion 304, 305 Projection 4 Name plate 41 Plate body 42 Plate fixing portion 43, 44 Rail portion 42a Projection 43a, 44a Tapered surface 5 Chassis 541, 551 Engagement hole 542, 552 Inclined surface 543, 553 Screw hole 6 Drive unit body 10 Case body 12 Front opening 121 Front opening end face 13 Rear opening 131 Rear opening end face 14 Left side wall portion 14a Inner surface of side wall portion 143, 153 Uneven surface 144, 154 Groove 145, 155 Insertion groove 15 Right side wall portion 151a, 152a Heat dissipation contact surface 20 Front frame 21 Frame main body 21a Insertion groove 21b Concave portion 2 Frame-shaped contact surface 23, 24, 25 Insertion rib 26, 27 For snap fit Person in charge Pawl 30 after frame 31 frame body 32 frame-shaped abutment surface 33, 34, 35 for insertion rib 37 threaded holes 38, 39 fixing screws

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) H05K 5/03 H05K 5/03 GH 7/20 7/20 B F term (reference) 4E360 AB14 AC01 AC12 BA08 BC06 BD03 EA18 EA22 EC05 EC12 ED02 ED03 ED23 ED27 FA03 GA06 GA24 GA53 GB43 GC04 GC08 5E322 AA03 AA11 AB04

Claims (11)

[Claims] 1. A unit case structure of a memory drive unit for reproducing and recording a recording medium, comprising: a cylindrical case body; a front frame attached to a front opening of the case body; and a rear frame attached to a rear opening of the case body. A unit case for a memory drive unit, comprising: a rear frame; and a chassis on which components of the memory drive unit housed in the case body are mounted. The case body is an extruded aluminum product. Construction. 2. The device according to claim 1, further comprising a spring member attached to the chassis, wherein the elastic member is restrained from moving up and down or left and right in the case body by an elastic return force of the spring member. The unit case structure of the memory drive unit, characterized in that: 3. The unit case of a memory drive unit according to claim 2, wherein the case main body is a vertically long flat rectangular tube, and the movement of the chassis in the left-right direction is restrained by the spring member. Construction. 4. The unit case structure of a memory drive unit according to claim 1, wherein the front frame and the rear frame are plastic molded products. 5. The case body according to claim 2, wherein the case main body includes a heat radiating chassis contact surface capable of surface contact with the chassis, and the elastic member has an elastic return force. The unit case structure of a memory drive unit, wherein the chassis is pressed against the heat-radiating chassis contact surface. 6. The frame according to claim 1, wherein the front frame has a frame shape corresponding to a front opening of the case body, and a snap formed integrally with the frame body. An engagement portion for fitting, and a contact surface formed integrally with the frame main body and capable of contacting an end surface of the front opening, wherein the chassis has a front end portion of the front frame. A unit case for a memory drive unit, comprising: an engagement portion capable of forming a snap-fit portion with the engagement portion; wherein the front frame is snap-fitted to a front end of the chassis. Construction. 7. The snap-fit part between the front frame and the chassis according to claim 6,
A unit case structure for a memory drive unit, wherein the unit case structure is formed on the upper and lower sides or on the left and right sides of the case body. 8. The frame according to claim 1, wherein the rear frame is formed integrally with the frame main body in a frame shape corresponding to a rear opening of the case main body. And a contact surface capable of contacting the end surface of the rear opening, and a screw hole, the chassis has a screw hole at a rear end thereof, and the rear frame is at a rear end of the chassis. A unit case structure of the memory drive unit, which is screwed. 9. The self-standing leg according to claim 1, further comprising a self-supporting leg detachably attached to a lower surface of the main body case. A main body, left and right side portions rising from the left and right sides of the leg main body, and an engaging convex portion or a concave portion formed on the inner surface of these side portions are provided. A unit case structure of a memory drive unit, wherein a concave portion or a convex portion engageable with an engaging convex portion or a concave portion formed on the leg extends in the unit case front-rear direction. 10. The device according to claim 1, further comprising a name plate detachably attached to a side surface of the main body case, wherein the main body case has a front opening or An insertion groove into which the name plate can be inserted through a rear opening; the name plate being slidably inserted into the insertion groove; and a plate fixing portion formed at one end of the plate main body. An engagement convex portion is formed on one of an inner surface of the plate fixing portion and an outer surface of the front frame or the rear frame facing the plate fixing portion, and an engagement concave portion is formed on the other. A unit case structure for a memory drive unit. 11. The plate body according to claim 10, wherein both side edges of the plate body facing the groove side surface of the insertion groove and connected to the plate fixing portion have a width or a thickness toward the plate fixing portion. A unit case structure of the memory drive unit, wherein a tapered portion having a gradually increasing height is formed.